What Does P043D Mean?
The catalyst temperature sensor circuit on bank 2, sensor 2 (post-catalyst) is reading above the maximum expected voltage threshold. This typically indicates an open circuit in the sensor, a broken wire, or a disconnected connector, causing the signal to float high toward reference voltage. The MIL will be illuminated and the PCM cannot monitor post-catalyst exhaust temperature.
Common Causes
35%
Open circuit in the catalyst temperature sensor element
25%
Broken or severed signal wire in the harness
20%
Disconnected or spread connector pins
12%
Sensor ground wire open causing signal to float high
8%
Signal wire shorted to 5V reference or battery voltage
Diagnostic Steps
1
Confirm the sensor PID reads at or near maximum voltage (4.9–5.0V) on the scan tool — this is consistent with an open circuit condition.
2
Disconnect the sensor and measure resistance across its terminals — an infinite/OL reading confirms an internally failed sensor element.
3
Jumper the signal and ground pins at the harness connector and verify the voltage drops to near 0V on the scan tool — this confirms the wiring from connector to PCM is intact.
4
Inspect the connector for backed-out pins, terminals that have lost retention, or corrosion that could prevent electrical contact.
5
Check the sensor ground circuit for continuity — measure resistance from the ground pin at the sensor connector to the corresponding PCM ground pin (should be less than 1 ohm).
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
The catalyst temperature sensor circuit on bank 2, sensor 2 (post-catalyst) is reading above the maximum expected voltage threshold. This typically indicates an open circuit in the sensor, a broken wire, or a disconnected connector, causing the signal to float high toward reference voltage. The MIL ...
The most common cause of P043D (Catalyst Temperature Sensor Circuit High (Bank 2 Sensor 2)) is: Open circuit in the catalyst temperature sensor element
Typical repair costs for P043D range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. The post-catalyst temperature monitoring system is non-functional. Normal vehicle operation is unaffected. Repair to restore emissions monitoring capability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P043D to identify the root cause.
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Quick Info
Category
Powertrain
System
Exhaust / Catalytic Converter
Difficulty
Type
Generic (SAE)
Recommended Tools
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